An event of numerous adults of Platyneuromus honduranus (Navás) gathering near the Usumacinta River in Chiapas state, Mexico, is reported. A sex ratio of 1:1.4 (male to female) was observed on a sample taken (n = 44), and it is compared to recorded sex ratios for other megalopteran species in the Sialidae and Chauliodinae. Oviposition far from the water is documented and discussed.
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